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Investments in Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Marketable Securities [Abstract]  
Schedule of Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments
The following is a summary of the cost, gross unrealized gains, unrealized losses and fair value of Investments in marketable securities:
 
 
December 31,
 
 
2018
 
2019
Cost
 
$
126.8

 
$
57.9

Unrealized gains
 
1.1

 
2.1

Unrealized losses
 
(8.6
)
 
(0.6
)
Fair value
 
$
119.3

 
$
59.4